Thank you LostBoyz Mike and Ulli.
Mike, i see you are a wireless T😉😉Ls specialist, i choosed makita because i had this model in my (virtual) cabinets.
Would be great in hand layer to add a property :
0=Hand , 1=Index finger (other part invisible) like that we can use the finger as an articulated arm.

And then, the best of the best to have the possibiliy to attach various layers to it (not only lightning and particles as today) as is done for sketch, so it would be possible to attach hand to this arm (or hand) or any EPS, model, text....which follow the movements of fingers flexion